/*
 * DayType 基础样式与全局设计系统变量
 * 遵循 Apple × MUJI × Things 极简克制设计语言
 */

:root {
  --canvas-bg: #FAF8F5;
  --card-bg: #FFFFFF;
  --card-hover-bg: #FCFBF9;
  --text-primary: #1C1B1A;
  --text-secondary: #7C7873;
  --text-tertiary: #A6A29C;
  --border-color: #E8E4DD;
  --border-subtle: #F0ECE5;
  --accent: #A06E46;
  --accent-light: #F6EDE5;
  --accent-hover: #8D5E38;
  --shadow-subtle: 0 4px 20px -2px rgba(28, 27, 26, 0.05);
  --shadow-card: 0 10px 30px -5px rgba(28, 27, 26, 0.06), 0 0 1px rgba(0, 0, 0, 0.05);
  --shadow-phone: 0 25px 50px -12px rgba(28, 27, 26, 0.12), 0 0 1px 1px rgba(28, 27, 26, 0.04);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1140px;
  --header-height: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas-bg: #1A1918;
    --card-bg: #242321;
    --card-hover-bg: #2B2A27;
    --text-primary: #F3F0EC;
    --text-secondary: #9F9C96;
    --text-tertiary: #6B6863;
    --border-color: #312F2C;
    --border-subtle: #292825;
    --accent: #DCB48C;
    --accent-light: #342A20;
    --accent-hover: #E7C6A5;
    --shadow-subtle: 0 4px 20px -2px rgba(0, 0, 0, 0.35);
    --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.45), 0 0 1px rgba(255, 255, 255, 0.05);
    --shadow-phone: 0 25px 50px -12px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.08);
  }
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--canvas-bg);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

/* 顶部导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s, border-color 0.3s;
}

@media (prefers-color-scheme: dark) {
  .header { background: rgba(26, 25, 24, 0.88); }
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  font-weight: 500;
}

.nav-link:hover { color: var(--text-primary); }

.btn-header {
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--text-primary);
  color: var(--canvas-bg);
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity 0.2s, transform 0.2s;
}

.btn-header:hover { opacity: 0.9; transform: translateY(-1px); }

/* 主容器 */
.main-content { flex: 1; }
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
}

/* 按钮通用组件 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--text-primary);
  color: var(--canvas-bg);
  padding: 14px 26px;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-subtle);
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -4px rgba(28, 27, 26, 0.15);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 14px 24px;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--card-hover-bg);
  border-color: var(--text-secondary);
}

/* 页脚通用组件 */
.footer {
  border-top: 1px solid var(--border-color);
  background: var(--canvas-bg);
  padding: 56px 24px 36px;
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-brand { max-width: 320px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.88rem; margin-top: 12px; }
.footer-links-group { display: flex; gap: 48px; }
.footer-col h4 { font-size: 0.88rem; font-weight: 600; color: var(--text-primary); margin-bottom: 14px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 0.86rem; color: var(--text-secondary); transition: color 0.2s ease; }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  max-width: var(--max-width);
  margin: 36px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: 12px;
}